Thursday, November 23rd, 2017

Energetic performance test of an underground air tunnel system for greenhouse heating

Publication year: 2010brbSource:/b Energy, In Press, Corrected Proof, Available online 17 July 2010brLeyla, Ozgener , Onder, OzgenerbrThe main objective of the present study is to investigate the performance characteristics of an underground air tunnel (UAT) for greenhouse heating with a 47m horizontal, 56cm nominal diameter U-bend buried galvanized ground heat exchanger. This system was installed in the Solar Energy Institute, Ege University, Izmir, Turkey. Based upon the measurements made in the heating mode, the average heat extraction rate to the soil is found to be 3.77¬†kW, or 80.21W/m of tunnel length, while the required tunnel length in meters per kW of heating capacity is obtained as 12.46. The entering air temperature to the tunnel ranges from…


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